Infoplease.com offers up an excellent conversion calculator, with weights/mass, length/distance, temperature and more.
Refdesk.com also offers up a comprehensive list of resources for conversion.
Below a courtesy of List of Common Weights and Measures
Length | ||
| Metric System | ||
| 1 millimeter = 1/1,000 meter | ||
| 1 centimeter = 1/100 meter | ||
| 1 decimeter = 1/10 meter | ||
| 1 meter (basic unit of length) | ||
| 1 dekameter = 10 meters | ||
| 1 kilometer = 1,000 meters | ||
| American and British Units | ||
| 1 inch = 1/36 yard = 1/12 foot | ||
| 1 foot = 1/3 yard | ||
| 1 yard (basic unit of length) | ||
| 1 rod = 5 1-2 yards | ||
| 1 furlong = 220 yards = 40 rods | ||
| 1 mile = 1,760 yards = 5,280 feet | ||
| 1 fathom = 6 feet | ||
| 1 nautical mile = 6,076.1 feet | ||
| Conversion Factors | ||
| 1 centimeter = 0.39 inch | ||
| 1 inch = 2.54 centimeters | ||
| 1 meter = 39.37 inches | ||
| 1 foot = 0.305 meter | ||
| 1 meter = 3.28 feet | ||
| 1 yard = 0.914 meter | ||
| 1 meter = 1.094 yards | ||
| 1 kilometer = 0.62 mile | ||
| 1 mile = 1.609 kilometers | ||
Area | ||
| Metric System | ||
| 1 square centimeter = 1/10,000 square meter | ||
| 1 square decimeter = 1/100 square meter | ||
| 1 square meter (basic unit of area) | ||
| 1 are = 100 square meters | ||
| 1 hectare = 10,000 square meters = 100 ares | ||
| 1 square kilometer = 1,000,000 square meters | ||
| American and British Units | ||
| 1 square inch = 1/1,296 square yard = 1/144 square foot | ||
| 1 square foot = 1/9 square yard | ||
| 1 square yard (basic unit of area) | ||
| 1 square rod = 30 1-4 square yards | ||
| 1 acre = 4,840 square yards = 160 square rods | ||
| 1 square mile = 3,097,600 square yards = 640 acres | ||
| Conversion Factors | ||
| 1 square centimeter = 0.155 square inch | ||
| 1 square inch = 6.45 square centimeters | ||
| 1 acre = 0.405 hectare | ||
| 1 hectare = 2.47 acres | ||
| 1 square kilometer = 0.386 square mile | ||
| 1 square mile = 2.59 square kilometers | ||
Volume and Capacity (Liquid and Dry) | ||
| Metric System | ||
| 1 cubic centimeter = 1/1,000,000 cubic meter | ||
| 1 cubic decimeter = 1/1,000 cubic meter | ||
| 1 cubic meter = 1 stere (basic unit of volume) | ||
| 1 milliliter = 1/1,000 liter = 1 cubic centimeter | ||
| 1 centiliter = 1/100 liter | ||
| 1 deciliter = 1/10 liter | ||
| 1 liter = 1 cubic decimeter (basic unit of capacity) | ||
| 1 dekaliter = 10 liters | ||
| 1 hectoliter = 100 liters = 1/10 cubic meter | ||
| American and British Units | ||
| 1 cubic inch = 1/46,656 cubic yard = 1/1,728 cubic foot | ||
| 1 cubic foot = 1/27 cubic yard | ||
| 1 cubic yard (basic unit of volume) | ||
| 1 U.S. fluid ounce = 1/128 U.S. gallon = 1/16 U.S. pint | ||
| 1 British imperial fluid ounce = 1/160 imperial gallon = 1/20 imperial pint | ||
| 1 pint = 1/8 gallon = 1/2 quart | ||
| 1 quart = 1/4 gallon | ||
| 1 U.S. gallon (basic unit of liquid capacity in the United States) = 231 cubic inches | ||
| 1 imperial gallon (basic unit of liquid capacity in some Commonwealth nations) = 277.4 cubic inches | ||
| 1 dry pint = 1/64 bushel = 1/2 dry quart | ||
| 1 dry quart = 1/32 bushel = 1/8 peck | ||
| 1 peck = 1/4 bushel | ||
| 1 U.S. bushel (basic unit of dry capacity in the United States) = 2,150.4 cubic inches | ||
| 1 imperial bushel (basic unit of dry capacity in some Commonwealth nations) = 2,219.4 cubic inches | ||
| Conversion Factors | ||
| 1 cubic centimeter = 0.06 cubic inch | ||
| 1 cubic inch = 16.4 cubic centimeters | ||
| 1 cubic yard = 0.765 cubic meter | ||
| 1 cubic meter = 1.3 cubic yards | ||
| 1 milliliter = 0.034 fluid ounce | ||
| 1 fluid ounce = 29.6 milliliters | ||
| 1 U.S. quart = 0.946 liter | ||
| 1 liter = 1.06 U.S. quarts | ||
| 1 U.S. gallon = 3.8 liters | ||
| 1 imperial gallon = 1.2 U.S. gallons = 4.5 liters | ||
| 1 liter = 0.9 dry quart | ||
| 1 dry quart = 1.1 liters | ||
| 1 dekaliter = 0.28 U.S. bushel | ||
| 1 U.S. bushel = 0.97 imperial bushel = 3.5 dekaliters | ||
Weight (Mass) | ||
| Metric System | ||
| 1 milligram = 1/1,000,000 kilogram = 1/1,000 gram | ||
| 1 centigram = 1/100,000 kilogram = 1/100 gram | ||
| 1 decigram = 1/10,000 kilogram = 1/10 gram | ||
| 1 gram = 1/1,000 kilogram | ||
| 1 dekagram = 1/100 kilogram = 10 grams | ||
| 1 hectogram = 1/10 kilogram = 100 grams | ||
| 1 kilogram (basic unit of weight or mass) | ||
| 1 metric ton = 1,000 kilograms | ||
| American and British Units: Avoirdupois | ||
| 1 grain = 1/7,000 pound = 1/437.5 ounce | ||
| 1 dram = 1/256 pound = 1/16 ounce | ||
| 1 ounce = 1/16 pound | ||
| 1 pound (basic unit of weight or mass) | ||
| 1 short hundredweight = 100 pounds | ||
| 1 long hundredweight = 112 pounds | ||
| 1 short ton = 2,000 pounds | ||
| 1 long ton = 2,240 pounds | ||
| American and British Units: Troy and Apothecaries' | ||
| 1 grain = 1/7,000 avoirdupois pound = 1/5,760 troy or apothecaries' pound | ||
| 1 apothecaries' scruple = 20 grains = 1/3 dram | ||
| 1 pennyweight = 24 grains = 1/20 troy ounce | ||
| 1 apothecaries' dram = 60 grains = 1/8 apothecaries' ounce | ||
| 1 troy or apothecaries' ounce = 480 grains = 1/12 troy or apothecaries' pound | ||
| 1 troy or apothecaries' pound = 5,760 grains = 5,760/7,000 avoirdupois pound | ||
| Conversion Factors | ||
| 1 milligram = 0.015 grain | ||
| 1 grain = 64.8 milligrams | ||
| 1 gram = 0.035 avoirdupois ounce | ||
| 1 avoirdupois ounce = 28.35 grams | ||
| 1 troy or apothecaries' pound = 0.82 avoirdupois pound = 0.37 kilogram | ||
| 1 avoirdupois pound = 1.2 troy or apothecaries' pounds = 0.45 kilogram | ||
| 1 kilogram = 2.205 avoirdupois pounds | ||
| 1 short ton = 0.9 metric ton | ||
| 1 metric ton = 1.1 short tons | ||
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